Apparatus for grinding and polishing glass.



APPLICATION FILED JULY 7, 1910.

Patented Sept. 13, 1910.

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Witnesses:

Attorneys.

A W. HORNIG. APPARATUS FOR GRIN DING AND POLISHING GLASS.

A PPLI GATION FILED JULY'I, 1910.

Patented Sept 13, 1910.

2 BHBETE-SEEBT 2.

' Witnesses: I

Inventor:

Attorneys.

UNITED STATESWBA'IENI curios.

AUGUST W. HORNIG, OF CHICAGO, ILLINOIS.

APPARATUS FOR GRINDING AND POLISHING GLASS.

Specification of Letters Patent. Patented Sept, 13, 1910.

Application fi1ed July 7, 1910. Serial No. 570,784.

To all whom it may concern:

Be it known that 1, AUGUST W. I'IURNIG, a citizen of the United States, and residentof Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Apparatus for Grinding and Polishing Circular Glass Plates; and I do hereby declare that the fol-.

lowing description of my said invention, taken in connection with the accompanying sheets of drawings, forms a full, clear, and exact specification.

This invention has generalv reference to improvements in grinding and polishing machines, and it is especially designed for grinding the peripheries of glass plates and for beveling the edges of circular and polygonal v lass disks and plates.

It consists, essentially, in the novel and peculiar combination of parts and details of construction, as hereinafter first fully set forth and described, and then pointed out in the claims.

In the drawings already mentioned, which serve to illustrate this invention more fully, Figure 1 is an elevation, partly in section, of my improved glass. grinding and bevelingmachine, the sectional portion of the figure being partly on. line as m of Fi 3. .Fig. 2 is a front elevation 'of the device drawn on an increased scale to butter to A in tl'iese drawings designates ivhat. is

technically known as a rub-bed lt comprises. a circular,-preferably cast-iron disk 12, of-su.itable diameter mounted upon a spider 13, secured to the upper end of a vertically disposed shaft or spindle 14, re-

"volving in a. step-bearing 15. atits lower end, and a suitable bearing in, near its upper cnd, the latter bearing being secured to a cross-timber or other suitable member 17, said shaft being rotated by a pulley 18 and suitable belting (not shown) or any other of several well-known'mcans for rotating said disk '12. .This rub-b'cd is in gencral'use in establishments engaged in the grinding and polishing of glass, marble, granite, and

similar material in slabs or plates, and these illustrate details of constructimi. Fig 3 is member Q whichserves as a'pivot for a plate 2:).

articles are placed upon the upper surface of the circular disk 12 and suitably anchored, and when necessary weighted down, the disk being rotated and pier and sand or other abrading substances placed upon the disk being employed for gril'u'ling and polishing the articles to be so operated upon.

In order to cnable a rub-bed, such as described, being successfully employed for grinding the peripheral edges of circular as well as polygonal glass plates, such as are used on automobile lamps, carriage lamps, picture frames, face plates of pressure and vacuum gages, clocks &c., ornamental windows. and many other articles of mam'ifacture, and for beveling the edges of these plates, I have invented the apparatus hereinafter described, which apparatus can be readily attached to, and removed from, the rub-bed, and which can be effectively em' ployed for the purposeheretoftn'e mentioned. This apparatus comprises a bracket 19, properly secured to the casing 20 surrounding the rub-bed, said bracket- 19 being designed to supporta vertically disposed post 2110 which the entire mechanism is moyably and adjustably secured. Upon this post thereis located a double sleeve B, consisting of a tubular member 22, slidably arranged magi/the post.- 21, and a tubular located at right angles to the member and preferably fOllllGd integral therewith, the latter member being adapted to function asa bearing for a shaft 24.

said plate being fastened to the shaft. EZ-Lhy a. SQl'rSCIQW' 2(3, or other suitable means.

To the plate 25 there is movably bolted.

28, having a long slot 29, through which. the bolts 27 are passed into the 1')la"te 27 This plate has at its lower edge. and at iboth of its ends bearings 30. 30, which are adapted to receive a shaft 31, carrying at one end a rope-sheave 32, by means of which and a suitable rope-drive including a rope 33, said shaft. 31 is slowly rotated. At the end of the shaft 31 opposite the one carrying the rope-sheave 32 there is rcmovably mounted a chuck or face-plate C, to be hereinafter more particularly described.

T he frame G has at the cud provided with the bearing 30, an upwardly projecting member-34. formed, preferably integral with by screws 27, a frame G, comprising a plate member 37 of which a bearing 88, adapted to receive the shank 40 of a clamping disk 39, said shank being in axial. line with the shaft 81, said clamping disk 89 being adapted to retain glass plates D, in position for external rrindmg.

The arm has an upwardly-orojeeting member 41, adapted to receive a guide-rod 42, which slides in an upwardl rejecting member 43, formed at the end of tl fe tubular sleeve 35, its object being to keep the arm 15' in proper positlon and prevent it from rotating with the rod 36.

Upon the post 21, and below the double sleeve B there is, movably arranged, a further double sleeve F, engaging said post 21 by its-tubular member 44, its second tubu-' lai member 45, located at right angles to, and formed integral with, the sleeve 44' bcing adapted to receive a movable rod 46, having at one end a head 47, in which 'is tapped an upwardly-projecting adjusting screw 48, said rod being held in adjusted position by a set-screw 49, in the sleevemember 45, shown in Fig. 2.

From the rear face of the frame G aprojects a stop 50, being by preference a screw held in adjusted position by a lock-nut 51, Fig. 3, said stop being adapted to limit the downward movement of the frame G beyond a predetermined point.

The operation of this apparatus and attachment to a rub-bed is substantially as follows: When circular disks of glass are to be gr und on-their peripheral edges, the frame G with its appurtenants is so adjusted with reference to the axial line of the shaft 31, that its axial line is above the upper surface of the rubbing disk 12 a distance equal to the radius of the finished disks, and parallel with the surface ofsaid rubbing disk 12. This adjustment is made by slacking a set-screw 52, in the sleeve member 22 of the part B, and raising or lowering this part'B until the prper position of the frame G is attained, when the scflscrt-uv 52 is again tightened. Now the double-sleeve F is raised or lowered, as the.

case maybe, after slacking the set-screw 4b In the slccws-lucmbcr- 44, until the adjusting screw 48 il])[)ll) .\1\ll]il.t0ly reaches the stop 50 on the frame G, final. adjustment being made by. the adjusting screw 48 in an obvious manner. Now a number of glass disks Dare placed in the space'betweei'i the faceplate (l and thc clampingplate 39 andthe 1.11amping-plate 35.) caused to-impinge upon the glass-plates D by rotating a knurled hand-nut located upon the screw-threaded.

portion of the rod'SG in the )roper direction to draw thearm E toward the frame G and the ,t'acc-plalc G. And, in order that these glass plates ulagv rozulily adhere to the faceplate (land one to the other, I place inthe faceplate a rubber disk 54, and between each glass plate a moistened sheet of paper or other suitable material 55, as indicated in Fig. 2. The rubbing disk is then rotated as well as the shaft 31, and Water and sand being supplied to the rotating disk 12, the edges of the glass plates are readily and rapidly ground until the stop 50 reaches the adjusting screw 48 which prevents further downward movcn' en't of the frame G, the )ivotal point of which is in the shaft 24. V hen circular plates are to be beveled, one plate only can be handled at a time. In this case I prefer to employ a faceplate (1, such as is shown indetail in Figs. 4 and 5, said face plate having a slightly projecting peripheral rim 56 to engage said glass disk I) by its peripheral edge and thereby to properly center the same. The fra-me'G is also placed at an angle of approximately 45 degrees to the plane of the rubbing disk, as illustrated at the right-hand illustration of Fig. 1, by making the proper changes in the various adjustments heretofore described with reference to the peripheral grinding of the glass disks. And, finally when it is desired to bevel the edges of polygonal plates, a proper chuck'or face-plate C is provided to hold the polygonal plates by their peripheral edges in the clamping device, but in this case the shaft 31 is not rotated and the edges of the plate successively subjected to the abrading action of the device. Inasmuch as sand and grit is likely to lodge in the recess in the face-plate C, I notch the peripheral rim of the same with a series of notches 57, Figs. 4 and 5, through which the sand can escape and be washed away.

While I have heretofore described this device .with reference to its use for grinding the edges of glass plates, it isobvious that the saline mechanism ma y be successfully employed for polishing the same, a suitable bed 12, and proper polishing material being all that is necessary to enable this device being used for the purpose indicated.

It will now be observed that ,by making the frame G laterally adjustable to the extent of the slotted aperture 2i) in the plate 28, I am enabled to change the position of the glass plates upon the-rubbing disk 12 by moving these plates nearer to, and farther away from the o'uter edge of the rubbing disk. This I find very desirable because it prevents the rubbing surface from being"- grooved and unevenly Worn, which it invariably would, \vcrcthe grinding always done at the same spot. To change this position at any time without disturbing the adjustment of the parts while the device is in' operation, I. provide the post 21 with a collar 58, which rests upon the upper surface of the bracket l9, and provide the latter bracket-with a set-screw 59, to hold the post 21' in adjusted position, whereby, by

slacking this screw 59, the post, and with it the frame Gr and its appurtcnants may be swung through an arc of a circle having its center in the said post, such an angular osition with reftu'ence to the radius line 0 the rubbmg disk 12 bemg shown in Fig. 3. It

will be further noted that while I have shown in Fig. l a rub-bed supplied with two of my attachments for grinding glass plates, any reasonable number of these attachments may be located around the rub-bed, the numberthereof depending upon the diameter of the rubbing disk 12, so that by employing a number of these attaclnnents, which can all be attended to vby a single person, I am enabled to grind, bevel and polish glass plates at an exceedingly low cost.

I have heretofore described the preferred embodiment of my invention, but I desire it understood that many changes in the details oft-(instruction may be made by a. mechanic skilled in the art to which this invention appertains Without departing from the scope 'of my invention.

.l-laving thus fully described this invention, I claim as new and desire to secure to me by Letters Patent of the United States '1. In a machine for grinding the peripheries and beveiing the edges of glass plates, an attachn'ient to the rub-bed, comprising an upright post, a frame pivotally secured to said post, a shaftin said frame, said shaft carrying at one end a faceplate adapted to hold said "glass plates, clamping-mechanism adapted to removably hold saidglass plates to said face plate, means, independent of the means which rotate the rub-bed and directly connected to the shaft in said frame, adapted to slowly'rotate said shaft, said means including a belt-driven pulley, and adjustable means adapted to limit the oscillatory n'iovement-of said pivoted frame to produce glass plates of uniform diameter, as described.

2. A machine for grinding the peripheries and beveling the edges of glass plates, adapted for mse in connection with arotaling rub-bed, comprising a vertically disposed post, -adouble sleeve movably dis' posed alpou said post, a plate pivoted in one member of said double sleeve, a frame se-.

cured to said plate, bearings on said frame,

a rotatable shaft mounted in said bearings,

a Face-plate at the end of said'shaft, a tubularsoelt'et on said frame, a screw-t1]readcd rod movable in. said socket, an arm at the outer end of said rod, an adjusting nut upon the serewthreaded portion of said rod, and a clamping disk mounted in the lower end of said arm and in axial line with said shaft.

8. A machine for grinding the peripheries and beveling the edges of glass plates, adapted for use in connection with a rotating rub-bed, comprising a vertically-disposed post, a double sleeve movably disposed upon said post, a plate pivoted in one member of said double sleeve, 8. frame adjustably secured to said plate, bearings on the lower edge of said frame, a rotating shaft mounted in said bearings, a pulley at one end of said shaft, a face-plate at the other end of said shaft, a tubular socket on said frame, a screw-threaded rod in said socket, an arm at the outer end of said rod,

an adjusting nut upon the screw threaded port-ion of said rod, a clamping disk mounted in the lower end of said arm and in axial line with said shaft, and means upon said post and adapted to cooperate with said frame to limit the downward movement of said frame.

4. The combination, with a vertically disposed post, of a double right-angled sleeve adjustably mounted upon said post, a plate, a shaft projecting from said plate and engaging one of the members of said double right-angled sleeves, a frame adjust ably secured to said plate, bearings at the .lower edge of said frame, an upwardlyprojecting member on said frame, a tubular sleeve at the upper end of saidupwardlyprojecting member, a shaft-in said bearings, a face-plate atthe outer end of said shaft, arod in said tubular sleeve, a downwardly projecting arm at the end of said rod, means adapted to draw said arm toward .said frame, a clamping disk journaled in said arm and in axial line with said shaft, 9. stopon said frame, and means secured to said post and cooperatingwith said frame to limit the downward movement of said frame.

In testimony that I claim the foregoing as my invention, I have hereunto set my hand in the presence of two subscribing witnesses.

. AUGUST W. noaure.

Witnesses MTCII'AEL J. STARK, A. S. Pn'r cnsoN. 

